Back-rest for stools, chairs, or seats.



No. 669,253. Patented Mar. 5, mm. A. FRASER. BACK BEST FOR STOOLS,CHAIRS, 0R SEATS.

(Application filed Oct. 8, 1900.)

(N0 Iodel.)

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NIKE, STATES 'FFICE.

BACK-REST FOR STOOLS, CHAIRS, OR SEATS.

SPECIFICATION forming part Of Letters Patent NO. 669,253, dated March 5,1901.

Application filed October 3, 1900. Serial No. 31,819. (No model.)

T0 at whom it may conceit 2 Be it known that I, ALLAN FRASER, a citizenof the United States, residing at Providence, in the county ofProvidence and State of Rhode Island, have invented a new and usefulImprovement in Back-Rests for Stools, Chairs, or Seats, of which thefollowing is a specification.

This invention has reference to an improvement in back-rests for stools,chairs, or other seats; and it consists-in the peculiarand novelconstruction whereby a yielding back-support may be secured to andreadily removed from the seat, as will be more fully set forthhereinafter.

In piano-stools, chairs, benches, and wagon and carriage seats it isdesirable to have a yielding or spring support for the back, and in someof these it is desirable that the support may be readily removed.

The object of this invention is to supply a yielding spring-back thatmay be'readily attached to and removed from a seat.

Figure l is an end view of a seat provided with my improved springback.Fig. 2 is a side view of the same, the yielding movement of the backbeing indicated in broken lines. Fig. 3 is a bottom view of thespring-support. Fig. 4 is a sectional viewof the spring-support throughthe center of the same. Fig. 5 is a sectional view of the supportthrough the center of one of the sockets in which the back is seen red.

In the drawings, 0, indicates the seat of a stool, and b a back-supportwhich may be of any desired form. It may be upholstered or of light openconstruction, such as is shown in Figs. 1 and 2, in which the transversebar I) is connected with the bar b by the rodsb Secured to the desiredform of the back Z) or forming part of the back are the rods 6 whichwhen the back is to be secured to the seat are inserted into the socketsc c, in which they are preferably secured by the clamp-screws c. Thesocketsccform part of the plate 0 which has the hook 0 by which it ispivotally connected with the plate cl by bearing on the bar (1,extending from the opposite sides d d of the plate below and across theopening d in the plate. The plate (1 has a hole with preferably concavedished margins, in which tests the head of the bolt, preferably so as topermit of a slight rocking movementol the head of the bolt 6. The boltextends through an opening in the plate 0 It is surrounded by the coiledspring e, which bears on the plate 0 at one end and on the flange of thenut e on the other end. The flanged nut e is in screw thread engagementwith the bolt 6 and can be adjusted to regulate the tension of thecoiled spring. The screwf in the plate 0 serves a stop by which theposition of the plate 0 may be adjusted and the normal posit-ion of theback b determined.

In type-writing, pianoplaying,driving,and

other occupations the adjustable spring-back forms a convenient restwhich may be applied to any kind of seat by securing the plate d to theunder side of the seat and inserting the rods b into the sockets c c.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a back-rest for stools, the combination with aplate secured to the rear of the seat, and a bolt supported by theplate. of a plate pivotally supported to the front of the first plate, aback secured to the pivoted plate, a flanged nut in screw-threadengagement with the bolt supported by the fixed plate, and a coiledspring interposed between the hinged plate and the flanged nut, asdescribed.

2. In an article of the nature described, the combination with the seat,a plate secured to the rear of the seat, and a bolt supported by theplate, of a second plate pivotally supported at the front of the firstplate and provided with two sockets, rods in the sockets extending fromthe back of the hinged plate, an adjustable support on the bolt, and aspring interposed between the pivoted plate and said adjustable support,as described.

3. In an article of the nature described, the combination with a plateadapted to be secured tothe seat provided with a bolt, of the back, therods b secured to the back, a plate provided with sockets and pivotallyconnected to the front of the first plate, a flanged nut in screw-threadengagement with the bolt, a coiled spring between the second plate andthe flanged nut, and an adjustable stop, as described.

10 f in the plate 0 the sockets c c, and the rods 5 Z) extending fromthe hack and supported in the sockets c c, described.

In testimony whereof I have signed my mune to this specification in thepresence of two so hscribing witnesses.

ALLAN FRASER.

Witnesses:

J. A. MILLER, J r., B. M. SIMMs.

